Hi Dan,
I've noticed on the ones that I have rewired, that the wiring behind the connector body to the firewall did not show the same heat degradation as the wiring on the engine side. My approach was to use the OEM type of connector that Volvo now uses (from sherco-auto.com), and completely rewire from the firewall down. I use a stranded thhn(plastic overcoat)wire that will hold up in the heat and oil environment and both crimp and solder all of my connections, reusing the sensor connectors when practical. I also pull any grounds that were originally broken through the connectors into a separate run and make multiple chassis ground points to tie them together.
Regards,
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Will Dallas, www.willdallas.us, www.willdallas.org, www.willdallas.com, www.dallasprecision.com 86 245 DL 222K miles, 93 940 260K miles, 88 765 GLE 152K miles, 88 780 246K miles, 93 Buick LaSabre 119,000 miles
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